4.2 mm, H 1 ¼ 1.1 mm, H 2 ¼ H 3 ¼ 1.36 mm, H 4 ¼ 1.36 mm, L 5 ¼ 6 mm, L 6 ¼ 6.5 mm, L 7 ¼ L 11 ¼7.4 mm, L 8 ¼ L 10 ¼ 10 mm, L 9 ¼ 10.6 mm, and L 12 ¼ 12.5 mm. The experimental circuit is fabricated on a substrate with relative dielectric constant of 2.65 and the thickness of 1 mm by standard PCB process.The manufactured prototype of the proposed power divider is shown in Figure 4. The size of the proposed power divider is about 32 Â 45 mm 2 , which does not include the size of 50-X feeding line and the length of the transition between the SIW and the microstrip. The measured insertion losses and the input return loss for the two-way equal SIW power divider can be observed in Figure 5, where they are compared with full-wave simulated results provided by the commercial software Ansoft HFSS. According to the measurements, the transmission response for the proposed power divider falls to at 3.48 GHz and at 5.2 GHz and the power divider has an insertion loss level of 3.7 6 0.5 dB, which includes 3.01-dB inherent insertion loss of two-way equal power divider. With regard to the input return loss, the power divider has a minimum value of 10.6 dB throughout the pass band. The out-of-band rejection is larger than 40 dB at 2.35 GHz and at 6.12 GHz, respectively. CONCLUSIONIn this article, a compact two-way equal SIW power divider with sharp out-of-band rejection has been presented. Experimental power divider has been built and measured. Good agreements are observed between the measured results and the simulations. This power divider is very suitable for application in low cost and compact size microwave and millimeter-wave planar circuits by traditional PCB technology. ACKNOWLEDGMENT Half mode substrate integrated waveguide (HMSIW) bandpass filter, IEEE Microwave Wirel Compon Lett 17 (2007), 265-267.ABSTRACT: A novel broadband bandpass filter with multiple resonant modes based on parallel-coupled microstrip line is proposed. The required cutoff frequency and out-of-band performance are achieved by placing L-shaped capacitive cross-coupling open stubs at the middle resonator with appropriate dimensions. A compact broadband bandpass filter of dimensions 18 Â 29 mm 2 is fabricated and tested for performance confirmation. The proposed filter demonstrates a wide bandwidth (from 3 to 7 GHz), as well as excellent out-of-band performance with more than 25-dB rejection up to more than 12 GHz and sharp upper cutoff frequency due to the proper location of two transmission zeros.

A coupled resonator diplexer has been designed, fabricated, and tested. The design is based on synthesis of coupling matrix of a 3-port coupled resonator circuit using optimization. Unlike conventional diplexers, the presented diplexer configuration does not include any separate junctions for distribution of energy. The diplexer has been implemented at X-band with waveguide cavity resonators, and its measured response is in good agreement with the simulated response

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